Summary of Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Available-for-sale - matures within one year, Amortized cost	$ 8,078	$ 11,803
Available-for-sale - matures within one year through five years, Amortized cost	75,927	71,539
Amortized cost, Total	84,005	83,342
Available-for-sale - matures within one year, Gross unrealized gains		3
Available-for-sale - matures after one year through five years, Gross unrealized gains	11	14
Gross unrealized gains, Total	11	17
Available-for-sale - matures within one year, Gross unrealized losses	(73)	(12)
Available-for-sale - matures after one year through five years, Gross unrealized losses	(1,497)	(683)
Gross unrealized losses, Total	(1,570)	(695)
Available-for-sale - matures within one year, Fair value	8,005	11,794
Available-for-sale - matures after one year through five years, Fair value	74,441	70,870
Fair value, Total	82,446	82,664
Certificates of deposits
Debt Securities, Available-for-sale [Line Items]
Available-for-sale - matures within one year through five years, Amortized cost	747	747
Available-for-sale - matures after one year through five years, Fair value	747	747
Fair value, Total	747	747
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Available-for-sale - matures within one year, Amortized cost	8,078	11,803
Available-for-sale - matures within one year through five years, Amortized cost	74,679	70,291
Available-for-sale - matures within one year, Gross unrealized gains		3
Available-for-sale - matures after one year through five years, Gross unrealized gains	11	14
Available-for-sale - matures within one year, Gross unrealized losses	(73)	(12)
Available-for-sale - matures after one year through five years, Gross unrealized losses	(1,485)	(677)
Available-for-sale - matures within one year, Fair value	8,005	11,794
Available-for-sale - matures after one year through five years, Fair value	73,205	69,628
Government bonds
Debt Securities, Available-for-sale [Line Items]
Available-for-sale - matures within one year through five years, Amortized cost	501	501
Available-for-sale - matures after one year through five years, Gross unrealized losses	(12)	(6)
Available-for-sale - matures after one year through five years, Fair value	489	495
Fair value, Total	$ 489	$ 495

Available for sale matures after one year through five years gross unrealized gains.

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Available for sale matures after one year through five years gross unrealized loss.

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Available for sale matures within one year, gross unrealized gains.

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Available For Sale Matures Within One Year Gross Unrealized Loss

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year through fifth year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security, measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year through fifth year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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